Improvement in feeding air to furnaces



A T. BENNETT. PedingAir to Furnaoes.

No. 211,082.f Patented Jan. 7, 1879.

ooooo ooo INVENTOB Wii/ orna NPETERS, PHDTO LITHDGRAFHER. WASMINGTONJ) c.

Nrr

ATES ATE rom ALLAN T. BENNETT, OF CHIOAGO, ILLINOIS, ASSIGNOR OF ONE-HALF HIS RIGHT TO AUSTIN P. WHITE, OF SAME PLACE.

IMPROVEMENT IN FEDING AIR TO FURNAGES.

Specfication forning part of Letters Patcnt No. 211,()52, datcd January 7, 1879; application filed i May 20, 1878.

To all whom it may concew:

Be it known that I, ALLAN T. BENNETT, of Chicago, in the county of Cook and State of lllinois, have nvented certain new and useful Improvements in Feeding Air to Furnaces, of which the following, in connection with the accompanying drawing. is a specification.

In the drawing, Figur-e l is a front View of a furnace in which my invention is enbodied, a portion of the front being broken away to show a part of the interior Fi g. 2, a vertical cross-section of the same in the plane of the line y y of i Fig. 3, and Fig. 3 a section in `the plane of, the line m m.

` Like letters of reference indicate like parts.

My invention relates to stoves, furnaces, and fuel-consumers in general, in which the combustion of the fuel is more or less imperfect, cwing to the imperfect commingling with the carbon, infiammable gases, and other products of combuston of the oxygen introduced with the air-Currents. I aim to render the combustion perfect by producing a proper ntermiX- ture of the oxygen with the particles of carbon and with the freed products of combus tion, and, as an essential feature of my invention, I accomplish this result to a great degree by impinging blasts of air either into, upon, or over the ncandescent fuel, or in any or all of these ways, through the instrumentality of means substantially the same as hereinafter described, and specifically set forth in the final Summary of my invention.

In the drawing, A represents a boiler-furnace constructed in accordance with the principle of my invention, and B is a boiler set thereon. D D, the side walls; E, the bridge-wall, and F the floor or base of the furnace. G is the fuel-chamber; H, the grate; and I, the ash-.

pit, and between the walls inclosing these parts and the outer or exterior walls first above referred to is an air-receiving chamber, J. The upper portions of the side walls of the fuel-chamber are incliued toward each other, by preference, as shown at cc a, and a' is an nclinedpartiton extending from the rear wall of the fuel-chamber to the bridge-wall.

K K are horizontal partitions extending from the side walls of the fuel-chamber to the C is the front wall of the furnace walls D D, and meeting the partition a' and the wall C. The chamber J is thns closed at the top by means of the partitions a' and K K, and, with the eXceptions hereinafter mentioned, is rendered tight by means of these partitions and the outer walls and bridge-wall. L is an air-fine entering the floor or base F, and' b b' are perforations passing through the inner walls of the chamber J.

The perforations b b, it will be perceived, enter the ash-pit, or are arranged below the grate and the perforations b' b' enter the fire box or chamber G, enterng above the grate. It will also be perceived that the `chamber J surrounds the fire-box and ash-pan, and eX- tends underneath the bottom of the latter and to the top of the former.

The bottom of the ash-pan and the walls of the fire-pot may be supported in any suitable manner, and the interior of the fire-pot maybe. "lined, if necessary, to prevent injury from the heat.

M M are dampers, arrangedin the chamber J, and stuated between the pcrforations b and b'.

In the example shown, the floor F is represented as raised sufficently to admit the flue L underneath it; but it s not absolutely essentialthat it should be raised for that purpose, as the flue L may enter the chamber J at some other place; but it should, to produce the best efft, enter the lower part of the chamber. There may also be more than one air-inductin g fine. The bridge -wall is open above the fire-box, to allow the air-currents, heat, and unconsumed products of combustion to ,pass out through the boiler-flues and enter the chininey or draft-fine in the usual manner. The front wall of the furnace may be provided with the doors and dampers commonly employed. a

The air maybe either forced into and through the flue L by means of a fan or blower employed for that purpose, or it may be drawn in by means of the draft-fine or chimney. enterng the chamber I becomes heated, owing to the position of the chamber with rela tion to the fire-box and ash-pit. y A part of this heated air enters the ash-pit through the perforations b b, and thns furnishes sufficient draft The air and enough oxygen to keep the fuel incandescent and produce the required amount of heat, the air passing, of necessity, up through or into the fuel. The remaining portion of the heated air entering the chamber J passes through the perforations b' b', and thus enters the fire-box in such a manner as to min gle with the products of combustion, and cause their combustion by supplyin g a due amount of oxygen.

The perforations b' b' may be so arranged as to cause the air passing through them to be either impinged upon or into the bdy of incandescent fuel, or both upon and into it.

The supply of air furnished to the perforations b and b' may be regulated by means of the dampers M M, a greater or less amount being thus shut off from one set of perforations and allowed to enter the other.

The heat radiated from waste-steam pipes or from the smoke-stack may also be utilized for heating the air entering the chamber J, the fire-pot, and the ash-pit; or an independent heater may be employed for that purpose.

It is to be understood, of course, that the air introduced through the air-inducting fiues is not to be sufficiently heated to destroy its Vitality before it reaches the fuel.

I am aware that air has heretofore been inducted into the fire-pot for the purpose of aiding combustion in addition to the air introduced for the purpose of producing a draft; and I do not, therefore, here intend to claim, broadly, the impinging of air into or upon the incandescent fuel for the purposes hereinbev fore set forth, the principal feature of my invention being the introduction of heated air, substantially as herein described.

lt is obvious that my invention may be used in connection with any kind of fuel and in connection with theseveral classes of fuel-consumers.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A fuel-consumer wherein the fire-pot is surrounded by an air-heatin g chamber extending underneath the ash-pit and entered by an air-inducting fine, and perforated to allow the air to escape from the said chamber into. the fire-pot, substantially as and for the purposes specified.

2. A fuel-consumer wherein the fire-pot and ash-pit are surrounded by an air-leatin g cham- I ber extending underneath the ash-pit and entered by one or more air-inducting fiues, and perforated both above and below the grate to allow the air to escape from the said chamber into the fire-pot and ash-pit, substantially as and for the purposes specified.

3. Afuel-consumer wherein the fire-pot and ash-pit are surrounded by an air-heating chamber entered by one or more air-inducting flues, and perforatcd both above and below the grate, the said chamber also containing one or more dampers arranged between the upper and lower series 'of perforations, substantially as and for the purposes specified.

4:. The air-heating chamber J, surrounding the fire-pot and ash-pit of a fuel-consumer and entered by the air-inducting fiue L, and also having therein the ports b and b' and the dampers M M, all arranged, substantially as specified, with relation to each other and the outer walls of the consumer for the purposes set forth.

ALLAN T. BENNETT.

Witnesses:

AUSTIN P. WHITE, F. F. WARNER. 

